mirrors/tinycc
1
0
Fork 0
mirror of https://github.com/frida/tinycc synced 2024-11-28 10:33:07 +03:00
Code Issues Packages Projects Releases Wiki Activity

ELF: Remove traces of old RUNTIME_PLTGOT code

Browse Source 
The last users of it went away, no use in keeping
this code.
This commit is contained in:
Michael Matz 2014-04-06 01:59:35 +02:00
parent 01c0419234
commit 6a947d9d26
3 changed files with 1 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
tcc.h
View File

@ -712,12 +712,6 @@ struct TCCState {
void *write_mem;
unsigned long mem_size;
# endif
# if !defined TCC_TARGET_PE && (0)
/* write PLT and GOT here */
char *runtime_plt_and_got;
unsigned runtime_plt_and_got_offset;
# define TCC_HAS_RUNTIME_PLTGOT
# endif
#endif
/* used by main and tcc_parse_args only */

64
tccelf.c
View File

@ -476,42 +476,6 @@ ST_FUNC void relocate_syms(TCCState *s1, int do_resolve)
}
}
#ifdef TCC_HAS_RUNTIME_PLTGOT
#ifdef TCC_TARGET_X86_64
#define JMP_TABLE_ENTRY_SIZE 14
static addr_t add_jmp_table(TCCState *s1, addr_t val)
{
char *p = s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset;
s1->runtime_plt_and_got_offset += JMP_TABLE_ENTRY_SIZE;
/* jmp *0x0(%rip) */
p[0] = 0xff;
p[1] = 0x25;
*(int *)(p + 2) = 0;
*(addr_t *)(p + 6) = val;
return (addr_t)p;
}
static addr_t add_got_table(TCCState *s1, addr_t val)
{
addr_t *p = (addr_t *)(s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset);
s1->runtime_plt_and_got_offset += sizeof(addr_t);
*p = val;
return (addr_t)p;
}
#elif defined TCC_TARGET_ARM
#define JMP_TABLE_ENTRY_SIZE 8
static addr_t add_jmp_table(TCCState *s1, int val)
{
uint32_t *p = (uint32_t *)(s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset);
s1->runtime_plt_and_got_offset += JMP_TABLE_ENTRY_SIZE;
/* ldr pc, [pc, #-4] */
p[0] = 0xE51FF004;
p[1] = val;
return (addr_t)p;
}
#endif
#endif /* def TCC_HAS_RUNTIME_PLTGOT */
/* relocate a given section (CPU dependent) by applying the relocations
in the associated relocation section */
ST_FUNC void relocate_section(TCCState *s1, Section *s)
@ -627,15 +591,6 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
#endif
h = x & 2;
th_ko = (x & 3) && (!blx_avail || !is_call);
#ifdef TCC_HAS_RUNTIME_PLTGOT
if (s1->output_type == TCC_OUTPUT_MEMORY) {
if (th_ko || x >= 0x2000000 || x < -0x2000000) {
x += add_jmp_table(s1, val) - val; /* add veneer */
th_ko = (x & 3) && (!blx_avail || !is_call);
is_thumb = 0; /* Veneer uses ARM instructions */
}
}
#endif
if (th_ko || x >= 0x2000000 || x < -0x2000000)
tcc_error("can't relocate value at %x,%d",addr, type);
x >>= 2;
@ -878,17 +833,7 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
long long diff;
diff = (long long)val - addr;
if (diff <= -2147483647 || diff > 2147483647) {
#ifdef TCC_HAS_RUNTIME_PLTGOT
/* XXX: naive support for over 32bit jump */
if (s1->output_type == TCC_OUTPUT_MEMORY) {
val = (add_jmp_table(s1, val - rel->r_addend) +
rel->r_addend);
diff = val - addr;
}
#endif
if (diff <= -2147483647 || diff > 2147483647) {
tcc_error("internal error: relocation failed");
}
tcc_error("internal error: relocation failed");
}
*(int *)ptr += diff;
}
@ -899,13 +844,6 @@ ST_FUNC void relocate_section(TCCState *s1, Section *s)
*(addr_t *)ptr = val - rel->r_addend;
break;
case R_X86_64_GOTPCREL:
#ifdef TCC_HAS_RUNTIME_PLTGOT
if (s1->output_type == TCC_OUTPUT_MEMORY) {
val = add_got_table(s1, val - rel->r_addend) + rel->r_addend;
*(int *)ptr += val - addr;
break;
}
#endif
*(int *)ptr += (s1->got->sh_addr - addr +
s1->sym_attrs[sym_index].got_offset - 4);
break;

13
tccrun.c
View File

@ -180,14 +180,6 @@ static int tcc_relocate_ex(TCCState *s1, void *ptr)
if (s1->nb_errors)
return -1;
#ifdef TCC_HAS_RUNTIME_PLTGOT
s1->runtime_plt_and_got_offset = 0;
s1->runtime_plt_and_got = (char *)(mem + offset);
/* double the size of the buffer for got and plt entries
XXX: calculate exact size for them? */
offset *= 2;
#endif
if (0 == mem)
return offset;
@ -215,11 +207,6 @@ static int tcc_relocate_ex(TCCState *s1, void *ptr)
set_pages_executable(ptr, length);
}
#ifdef TCC_HAS_RUNTIME_PLTGOT
set_pages_executable(s1->runtime_plt_and_got,
s1->runtime_plt_and_got_offset);
#endif
#ifdef _WIN64
win64_add_function_table(s1);
#endif